As far as I'm aware, we still do not know the first intermediate species of SARS-1 (cf Wikipedia: "Infected palm civets at the market were traced to farms where no infected animals were found. It is unknown whether the virus was originally introduced to the market by civets, humans, or another animal." and "Phylogenetic analysis of these viruses indicated a high probability that SARS coronavirus originated in bats and spread to humans either directly or through animals held in Chinese markets.") So no, it hasn't been months, but 20 years...